GloBE Jurisdictional ETR Calculator

Computes a jurisdiction's OECD Pillar Two (GloBE) effective tax rate from caller-declared constituent-entity financial data: sums entity-level GloBE income/loss to a jurisdictional net (Art 3.1), sums entity-level adjusted covered taxes (Art 4), and divides to get the ETR. If the jurisdictional net is a GloBE loss, no ETR is computed and the jurisdiction is flagged rather than divided by a non-positive base. Top-up tax percentage = max(0, minimum_rate - ETR); minimum_rate defaults to the Art 5.1 15% rate but is taken as a versioned policy-parameter input, not hardcoded. Election flags (de minimis, stock-based comp, aggregate deferred-tax adjustment) are caller-declared policy parameters -- this kernel echoes which elections were declared, it does not decide them; election judgment and DTA characterization stay with the filer. First node in the GloBE annual cycle, feeding the substance-based income exclusion / top-up node (art-455) and, downstream, the safe-harbour tests (art-456) and GIR composer (art-457). Pure arithmetic aggregation only. NaN-safe. Zero network, zero PII.

Tool URL: https://ainumbers.co/chaingraph/art-454-globe-jurisdictional-etr.html